They applied for a search warrant and during the subsequent process of finding drugs in the apartment, they also located the explosive devices, Kadingo said.

The borough fire department and the Bethlehem Fire Department bomb squad were called in and the devices were eventually secured and removed, Kadingo said. The devices are in the possession of the FBI, the chief said.

There was one person, believed to be involved in the burglary, in the apartment when police arrived, Kadingo said.

No one has been charged and the investigation is continuing, he said.

Northampton County records show police left the apartment at 12:39 a.m. Tuesday.